SU1036365A1 - Percussion action mill - Google Patents

Description

The invention relates to non-impact impact1 with internal centro () classification and can be used for fine grinding of various materials: soft and medium hardness. A percussion mill with internal centrifugal classification is known. The mill contains a cylindrical body, a horizontal rotor with working elements and a classifier, including a low pressure fan and return pipes. The thin fraction of the air flow generated by the working elements of the mill is removed from the grinding zone between the rotor (imis blades to the classifier and coarse fractions are thrown into the return nipple due to centrifugal forces and returned to the grinding zone through this mill. as a classification process, it is carried out in highly turbulent noTOKax. Therefore, the grinding product is 100% less than 0.5 nm, the efficiency is 30-A (p1. Iai (the closest technical solution is a percussion mill). Twi containing a cylindrical core with a baffle plate and a rotor installed in it with working elements and classification blades The mill works as follows. The material subjected to grinding is fed to the classification blades where it is formed into spiral flows. It is conveyed to the discharge port, and the coarse material is returned to the mill by the suction of air created by the working elements. However, despite the classification blades partially stabilize the dust-air flow, there is still a turbo lysis, and therefore the grinding fineness is lOOf not 20 microns. The purpose of the invention is to increase the efficiency of the grinding process. The goal is achieved by the fact that in a mill containing a cylindrical body with fender plates and a rotor installed in it with working elements and classification blades, V-shaped blades are mounted on the rotor, the tops of which lie on a circle whose radius is 1 / 6- 1/3 of the rotor radius, with one side of each blade located tangentially to this circumference and its end is on circumferential ty, the radius of which is equal to the rotor radius, and the other side is first in the course of the rotor rotation, 1 / 3-1 / 8 downcomers rotor has openings located on the bisector of the angle of V-shaped blades and vanes are disposed between the classification parties V-shaped blades and are bent in a spiral, with their center may coincide with the center downcomers holes. FIG. 1 shows the proposed mill, a general view; in fig. 2 is the gap A-A in FIG. 1 (disk of the mill with loading, accelerating and separating zones; in Fig. 3, section BB in Fig. 1, ventilation vanes). The mill contains loading 1 and 2 unloading nozzles, body 3 and cover ". The fender plates 5 are attached to the inner surface of the body. In the mill body, on the shaft 6 is a rotor with working elements 7 of the two disks 8 and 9 between which I fixed blade-shaped blades 10 and classification blades 11. In addition, in the lower rotor disk there are overflow holes 12 and ventilation blades 13 are attached on the discharge pipe side. There is a partition T between the lid and the mill casing. This is the boundary demarcation shell 15. V-shaped blades have sides of different lengths. If the short side of the V-paddle blade is less than the long side by more than 1/3 to 1/2, then an undersized mat gets into the finished product; The proportion of the coarse fraction in the finished product increases by 15-20%. An increase in the short side of the V-shaped blade (the short side less than the length by less than 1/8) leads to an overload of the mill, which in turn leads to the ingress of the coarse fraction in the finished product to 10–20%. The tops of the Y-shaped blades lie on a circle with a radius of 1 / 6-1 / 3 radii: usa rotor, increasing the radius of this circle from 1/3 to 1/2 leads to a decrease in the sides of the Y-shaped blades

which, in turn, reduces the | n of channels of the acceleration zone, particles moving along shorter channels do not receive sufficient energy of such destruction. In the finished product, the proportion of the coarse fraction increases by 20-30%. A decrease in the radius of the circle on which the tops of the V-shaped blades from 1/6 to 1/8 of the rotor radius leads to a decrease in the loading zone, which, in turn, reduces the productivity of the mill by 25-33%

The design of the mill is such that the long side of the Y-shaped blades is tangent to a circle whose radius is equal to (1 / 6-1 / 3) of the rotor radius. The size of the long side of the following blade-shaped blade: the tip of the y-o (the phase blade lies on the circumference (1 / 6-1 / 3) of the rotor radius, and its end is on) (no less than the radius of the rotor. The other side: shorter than it by 1 / 3-1 / 8. The flask operates as follows: Source material from the hopper through feed nozzle 1 is fed into the center of the rotor and enters the acceleration zone channels. In the acceleration zone channels, the particles are accelerated, the dust-air mixture is due to the narrow the channel is stabilized and ejected through the channel in the separation zone, where separation into rugged and small classes. Separation is carried out under the action of centrifugal, Coriolis and air flow forces. Dust-air mixture falls on the classification blades 11, where it is further stabilized and formed into laminar spiral flows. Air with a small class of particles moves inwards and vent holes 17. ventilators

The blades 13 are sucked out of the mill, and the large classes are thrown onto the working bodies of the rotor 7. Then, after the impact-reflection load. Neither the dust – air mixture due to the air suction generated by the ventilation blades 13 and the classification blades 11 enters the upper part of the mill, where additional separation of the material being crushed occurs due to the circulation of the dust – air flow. Small classes on the demarcation barrier 15 are fed to the classification, and large classes fall on the upper disc of the rotor 9i where, due to centrifugal forces, they are again thrown onto the working bodies.

Production of high-grade fineness of grinding is achieved thanks to that. that in the mill of this design the threefold separation of the material being ground is carried out. The first separation is carried out by V-shaped blades, one side of which — the first one in the direction of rotation of the rotor — is shorter than the other one by 1 / 3-1 / 8. The second separation is carried out by classification blades located between the short and long sides of the Y-shaped blades and curved in a spiral, the center of which coincides with the center of the overflow holes. The third separation is i-the demarcation ion and upper discomrotor. The positive effect of the application of the present invention is to increase the efficiency of the grinding process, which allows to obtain a finished product with a narrow granulometry composition (. For example, |; salt) 100% ground material is obtained with a particle size less than 1 micron).

fO

P6fB, Z

B-s

/ J

ig.Z

Claims (2)

1. MILL OF SHOCK ACTION, comprising a cylindrical body with baffle plates and a rotor installed in it with working elements and classification vanes, different. in order to increase the efficiency of the grinding process, V-shaped blades are mounted on the rotor, the vertices of which lie on a circle whose radius is 1 / 6-1 / 3 of the radius of the rotor, and one etoron of each blade is tangent to this circle and its end is on a circle whose radius is equal to the radius of the rotor,. and the other side is the first in the direction of rotation of the rotor, 1 / 3-1 / 8 shorter than the first, and the rotor has transfer openings located on the bisector of the angle of the V-shaped blades, and the classification blades are located between the sides of the V-shaped blades and are bent in a spiral . 2. Mill pop. 1, with the fact that the center of the classification vanes coincides with the center of the transfer holes. SU go, 1036365 1036365 1